JP2000510560A - Motor reduction gear for driving vehicle equipment - Google Patents

Abstract

(57) Abstract: This motor reduction device includes a rotor having a rotor shaft, a reduction gearbox (2) including a gear (3) that meshes with an endless screw of the shaft, and is housed in and fixed to the gear. And a damper (5) rotating integrally with said gear, said single-piece damper containing the radial fins (7) of said gear and simultaneously containing the element (10) for driving the output member (11). A plurality of peripheral notches (8) having the following configuration, the edges of the notches being chamfered (90). The chamfer makes the angular deflection of the damper gradual as a function of torque and facilitates automatic fixing of the gear to the hub.

Description

DETAILED DESCRIPTION OF THE INVENTION                     Motor reduction gear for driving vehicle equipment   The subject of the present invention includes a motor reduction gear, in particular a rotor shaft, a damper together with sealing means. Gearboxes including endless screws that mesh with pinion gears, and dampers For driving vehicle equipment of the type consisting of a rotor with a more rotating output member To a motor speed reducer.   The reduction gearbox of the current motor reduction gear is composed of the following parts. That is, the teeth A cable for winding cables such as cars, hubs, lip seals, covers, and window elevator cables Stick drum or pinion made of fired steel, and overmold Consists of a plastic hub.   This configuration includes a relatively large number of components, which leads to high manufacturing costs.   Furthermore, there is an axial play in the line of the shaft mounted on the motor reduction gear. This axial direction Play of the various components of the assembly (from end to end in its housing) (Shafts, stoppers, boxes, cases, etc.).   Conventionally, this axial play was accommodated at the end of the box facing the hole in the rotor shaft. The adhesive that is corrected by manual operation of the screw and forms a seal at the same time More fixed. Such an adjustment method takes a long time, so the motor deceleration Increases the manufacturing cost of the device.   U.S. Pat. No. 5,169,245 provides an axial play with an axial play at the end of the rotor shaft. Use a coil spring that provides thrust. Part of the spring into the shoulder of the box when a certain amount of compressive force is applied. Correct by contact. In such a device, the spring is acted upon by the action of an axial force. The air accumulated in the spring when compressing and changing the direction of rotation of the motor reduction gear Nergie is released suddenly. In that way, the opposite end of the rotor shaft is Violently, which causes very annoying noise.   Finally, another problem is that the ring shrinks between the motor reducer shaft and stator. You. This is a consequence of the irregular diameter of the housing at the end of the stator, Due to changes in the inner diameter of the ring. Therefore, there is no radial gap between the shaft and the ring. This is a rule, which causes a troublesome vibration of the shaft.   An object of the present invention is to simplify the structure as compared with the known motor speed reducer, and Accordingly, it is an object of the present invention to manufacture a motor reduction gear having a low manufacturing cost.   The present invention is also inserted between the rotor shaft and stator to reduce shaft vibration. Another object of the present invention is to improve the control of the inner diameter between the ring and the rotor shaft.   Another object of the invention is simple, effective and inexpensive, with the danger of damaging the adjusting device. Automatic play of the axial direction of the axis of the motor reduction gear To be corrected.   According to the invention, the sealing means comprises an annular wall of the gear, and the annular wall and the box. Consisting of a seal arranged between the walls, said seal being fixed to said box and Sliding on the annular wall or fixed to the annular wall and Sliding at least one lip of the seal and the annular wall A seal is formed between them.   According to one feature of the invention, the damper is formed as a single piece, and On the one hand to accommodate the radial fins of the gears and on the other hand to drive the output members. A plurality of peripheral notches designed to accommodate the element, and the edge of the notch Beveled.   According to one embodiment of the present invention, the damper is provided on at least one surface thereof with the gear and the front gear. The output member to provide a volume required for expansion of the damper when compressed. Means for centering within the cavity.   The chamfering of the damper has a double advantage. That is, on the one hand, as a function of torque The angular deflection of the damper is made gradual while, on the other hand, the automatic fixing of the damper on the hub of said gear. Make it easier.   According to another feature of the invention, the motor reduction device comprises the damper, the seal, and And an output member composed of a drum coaxial with the gear, and the damper is provided inside the gear. And are fixed there so that they can rotate together. The drum is specifically intended to receive cables for cable operated window lifts are doing. The drum has means for fixing to the damper, both of which are It is designed to rotate as a body.   The fixing means may comprise a finger portion of the drum cooperating with the damper. No.   Thus, the damper itself replaces the drum with an intermediate plastic hub. Therefore, it is driven directly. Therefore, the intermediate plastic hub can be omitted. Reduce the number of parts.   According to another feature of the invention, the output member is a single piece having a hub in the gear. And preferably formed of fired steel. This pinion And single piece form of hub by overmolding hub on fired pinion Manufacturing costs are saved in comparison with the costs of the corresponding conventional parts formed.   According to another particular form of the invention, the means for automatically adjusting the axial play is provided by an elastic material. Formed damping stopper and a metal washer embedded in the stopper The end of the shaft is preloaded to automatically compensate for axial play. Re-energize the washer.   This stopper device is added by the damper when the motor speed reducer operates. The axial compression load can be limited to a predetermined value.   Furthermore, the use of elastic dampers instead of coil springs To eliminate disadvantages. In fact, elastic elements are modified by internal friction between the molecular chains of the elastic material. It has the property of absorbing some of the energy of the shape. D generated by this bearing force Some absorption of energies significantly attenuates the annoying noise when turning the motor be able to.   The maximum force by the damper is, for example, 100 Newton according to the standard force. You. Beyond this value, the axial force transmitted by the rotor shaft during operation of the motor reduction gear Is applied on the wall of the box via a stop device, and this Eliminates the danger of being damaged by axial forces.   The rigid stopper has a means for preventing rotation about the axis of the rotor shaft. It is advantageous to have.   Other features and advantages of the invention will now be described, by way of non-limiting example, with reference to the accompanying drawings, in which: Will be revealed.   FIG. 1 shows a part of one embodiment of a motor reduction device according to the invention, in particular a reduction gearbox. It is an exploded view.   FIG. 1A is a partial cross-sectional view of the seal between the gearbox wall and the gear collar at 22 of FIG. FIG.   Figure 2 shows a longitudinal section of one end of the rotor shaft and the gearbox wall FIG. 5 is an enlarged view showing the means for automatically adjusting the axial play according to the invention. .   FIG. 3 is an enlarged partial cross-sectional view of one end of the rotor shaft and a longitudinal elevation of the stator. 1 shows an embodiment of a ring according to the invention inserted between a stator and a stator.   FIG. 4 is a perspective view of a pinion that may constitute an output member of the motor reduction device.   FIG. 5 is provided with a device for automatically correcting axial play in an axis according to the present invention. FIG. 4 is a partial longitudinal sectional view of the motor speed reducer.   FIG. 6 shows the means for adjusting the axial play between the end of the rotor shaft and the wall of the gearbox. FIG. 2 is a partial cross-sectional view of one embodiment enlarged from FIG. It is in the rest position.   FIG. 7 is a sectional view taken along line 7/7 in FIG.   FIG. 8 shows the automatic play in the axial direction at the no-load position of the motor speed reducer assembled on the axis. FIG. 7 is a view similar to FIG. 6 showing the device for adjusting.   FIG. 9 is a view similar to FIG. 8 showing the device in a position in operation of the motor speed reducer. You.   FIG. 10 shows the motor reduction as a function of the compression force applied by the damper of the automatic play compensator. FIG. 4 is a graph showing a change in axial force transmitted by a gearbox onto an axis of a speed device. .   The motor speed reducer shown in FIGS. 1 to 4 is particularly used for vehicle drive equipment such as an electric window elevator. Is intended.   This motor speed reducer has a rotating shaft with a rotor shaft with one end 1 shown (FIG. 2). Child (not shown), including a gear 3 mounted on its axis 4 perpendicular to the rotor axis It consists of a reduction gearbox 2. The gearbox is an endless screw that meshes with the gear 3. Ryu (not shown). The motor reduction gear is further housed in the gear 3 and Concentric with hub 6 A single-piece damper 5 which is preferably attached to the A radially engaging notch 8 of the damper 5 formed by The fin 7 is further included. The edge of the notch 8 is formed on the chamfered surface 90.   The damper 5 is centered in a cavity defined between the gear 3 and the output member 11. On at least one side thereof. In this example, these hands The step is formed integrally with a rest of the damper 5 and has a stud projecting from its surface. ９８98. Stud 98 provides the centering action described above and compresses To provide the necessary volume for expansion of the damper 5   Finally, the reduction gearbox 2 has an annular seal 9 coaxial with the damper 5 and the gear 3. And the drum 11. This drum is especially used for cable operated window elevators. And constitutes the output member of the motor speed reducer. Seal 9 On a metal washer 40 (FIG. 1A) which is pressure fitted to the reduction gearbox 3, for example, Manufactured by overmoulding. Seal 9 is inside gear 3 It has at least one lip 9a that slides against the annular wall 12. Annular wall 1 2 is that the connection between the gear 3 and the hub 6 is outside this hub and inserted between the shaft 4 and the gear 3 It is necessary because it is not done.   Alternatively, the seal may be fixed to a collar and its lip may be a gearbox. It may be configured to slide on the wall of the box 2.   The inner annular wall 12 is slightly longitudinally towards the drum 11 relative to the teeth of the gear 3. Protrude. The annular seal 9 installed between the annular wall 12 and the wall 13 of the box 2 And seal the gearbox without the need to install a cover.   For this purpose, the seal 9 can be provided, for example, by a tab 14 which is elastically locked to the gearbox. Is fixed to the wall 13 of the gearbox 2 and slides Biasing around the annular wall 12 or, for example, the clearance between the annular wall 12 and the base of the gear 3 It is fixed to the annular wall by an appropriate means such as firmly mounting between, and slid to the wall 13. Energize.   The drum 11 is provided with means for fixing to the damper 5, whereby the drum 11 is integrated with the damper 5. Rotate. In the illustrated embodiment, the fixing means is the finger portion 10 of the drum 11. And the finger portions 10 engage with the corresponding notches 8 in the radial direction. For example Six notches 8 are formed, three of which receive the finger 10 and the other three Receives the fins 7. With this configuration, the motor speed reducer conventionally used The intermediate plastic hub can be omitted and the damper 5 drives the drum 11 directly.   In another embodiment of the present invention, the motor reduction device is provided inside the annular wall 12 of the gear 3. An output comprising a pinion 16 formed as a single piece with a step 17 (FIG. 4) The member 15 is included. The output member 15 is preferably formed of fired steel. Hub 17 is compatible The output member 15 is fixed to the damper 5 by providing To allow the two to rotate together.   The motor reduction gear is a shaft between the end 1 of the rotor shaft and the wall 18 of the gearbox 2 (FIG. 2). A means for automatically adjusting the play in the direction is provided. In the illustrated example, the adjusting means Is formed of an elastic material such as rubber and fills the volume defined at this point by the wall 18 From the damping stopper 19 and the metal washer 21 embedded in the stopper 19 Become. More precisely, the washer 21 is housed in the surface of the stopper 19 facing the shaft 1. As a result, the surface of the washer 21 merges with the surface crossing the stopper 19.   The end of the shaft 1 is fixed to a plastic cap for urging the washer 21. . Rotor shaft 1, end cap 22, washer 21, and The assembly constituted by the damper 19 and the damper 19 automatically corrects the axial play of the shaft 1. Are mounted in the wall 18 with a slight preload.   According to another feature of the motor speed reducer, the rotor shaft opposite the stop 19 The end 23 of the ring bearing 2 is formed by two steps 25 and 26 in the radial direction. 4 to be mounted.   The first step 25 has an outer diameter equal to the diameter of the inner wall of the biasing stator 20, while The inner diameter d1 is larger than the outer diameter d of the shaft 23. The second step 26 is provided with It has the same inner diameter as the outer diameter d, and the outer diameter d2 is smaller than the diameter of the inner wall of the stator 20 .   Thus, the annular gap 27 between the rotor shaft end 23 and the first step 25, and An annular gap 28 is formed between the second step portion 26 and the stator 20.   The diameter of the second step 26 contacting the shaft 23 is Since there is no change in the dimensions of the stepped link, The bush 24 improves the control of the play of the shaft 23. Therefore, the irregularity of this wall is the first step 25, and the load of the second stage 26 is transmitted to the first stage 25. Obedience Thus, the vibration of the shaft 23 is reduced so as to be evaluated.   The motor speed reducer 100 of FIG. 5 is intended especially for driving a vehicle such as an electric window elevator. I have.   Housed in a casing 200 and marked by electrical connections 400 in a known manner The stator 300 which can be added, the rotor shaft 6 whose ends are mounted on the bearings 700, 800 And a rotor 500 comprising This rotor shaft is, for example, a window elevator, Drives an output member 120 that drives a device connected to a motor reduction device such as a roof. An endless screw 900 that meshes with the gear 110 is carried.   Of the axial force F applied by the rotor shaft 600 when the motor speed reducer operates. Rotation through bearing 700 near endless screw 900 to maintain balance The end 600a of the slave shaft 600 is connected to the end 600a and the wall 130 of the reduction gearbox 140. It cooperates with a device 120 for automatic correction of axial play between.   In the illustrated embodiment, the adjusting device is provided at the end c of the end of the wall 130 of the box 140. Elastomer or the like installed in the housing 170 with a radial annular gap (FIG. 6) A damper 150 made of an elastic material, and an end 600a of the shaft 600 It comprises a rigid stopper 180 inserted between the dampers 150. The rigid stopper 180 It is preferably formed of metal and is formed on the cylinder, for example by a deformable material. A cylindrical pad for urging the end face of the damper 150 is formed. The stopper 180 is Similarly, the end cap 190 fixed to the end 600a of the rotor shaft 600 comes into contact with the end cap 190. You. The rigid stopper 180 is provided between the stationary position under no load (FIG. 6) and the motor speed reducer. In the predetermined movement range d corresponding to the axial play of the axis between the load positions (FIG. 9) due to the movement. It moves axially within the box 140. This movement range d is And a transverse direction disposed in the inner wall of the box 140 facing the damper 150. It is limited by the stopper means constituted by the annular shoulder portion 210.   The rigid stopper 180 provides a means for preventing rotation about the axis of the rotor shaft 600. Have. In the illustrated embodiment of FIG. 7, this means is Formed in the wall 130 of the box 140 And two tabs 220 which engage with corresponding cutouts 230. Notch 230 forms a hole, which is formed when the stopper 180 covers the movement range d. Traverse the shoulder 210 to slide the tab 220 into the hole in the notch 230 The surface is formed in the longitudinal direction.   The operation of the device for automatically correcting the axial play is as follows.   Before assembling the axis, the stopper 180 has play d between the shoulders 210. After assembling the motor speed reducer with no load, the d A preload of the force F1 is given as a function of the smaller dimension d1 (FIG. 8). This position The damper 150 receives a pre-compression force of, for example, 1 to 100 Newtons. And the remaining play or distance d1 is determined by the motor reduction gear (shaft 600, stopper, Box 140, casing, etc.).   The spacing or play d1 and play d are represented in the graph of FIG. In the graph, the rotor shaft 600 on the stopper 180 and the damper 150 The applied axial force F is F1 by the time the stopper 180 contacts the shoulder portion 210 traversed. From F2 to F2. The maximum force F2 applied by the stopper 150 is the moment For example, 100 Newton.   When the motor reduction gear operates and the axial force F on the axis exceeds a predetermined value F2, the metal The stopper 180 comes into contact with the shoulder portion 210, which reduces the compressive force on the damper 150. Limit to the above values.   This restriction prevents the elastic material of the damper 150 from being distorted, so that the stopper 180 When the stopper 180 is brought into contact with the shoulder portion 210 by an axial force exceeding the value F2, Prevent damage. The axial force applied by the shaft 600 suddenly increases (see FIG. 10). (Rough) and transferred directly onto the shoulder 210 and onto the wall 130 of the box 140 It is.   The present invention is not limited to the illustrated embodiments, but includes various other embodiments. Thus, for example, rigidity Any means for preventing the rotation of the stopper 180 can be used, and may include only one tab or The pad 220 can be selectively adopted.   Device for automatically correcting axial play of the rotor shaft according to the present invention Is simple to manufacture and therefore inexpensive, while limiting the compressive force of the damper 150 Has good durability, which protects the damper from damage as described above. Protect.   Optionally, the seal 9 may have a plurality of lips, for example two.

────────────────────────────────────────────────── ─── Continuation of front page    (81) Designated countries EP (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, L U, MC, NL, PT, SE), AU, BR, CA, J P, MX, US

Claims (1)

[Claims]   1. Rotor with rotor shaft (1, 23), damper (5) with sealing means Reduction gearbox (2) including endless screw meshing with gear (3) including , And an output member rotated by the damper, wherein the sealing means is a gear ( 3) the annular wall (12), and the annular wall (12) and the gearbox wall (1). 3) consisting of a seal (9) arranged between them, said seal being fixed to said gearbox. Fixed on the annular wall by sliding, or fixed to the annular wall, Sliding contact on the gearbox, at least one of the seals (9) Vehicle equipment characterized in that it is configured to seal between a gap (9a) and the annular wall. Motor reducer for driving the motor.   2. The damper is formed as one piece and has radial fins (7) of the gear; And an element (11; 30) for driving the output member (10; 15). A plurality of peripheral notches (8), and the edges of the notches are chamfered (90). The motor reduction gear transmission according to claim 1, wherein:   3. The damper (5) has, on at least one surface thereof, the gear (3) and the output. The volume defined between the members (11; 15) and required for expansion of the damper during compression; Providing means for centering in the cavity provided. The motor reduction gear of claim 1.   4. The centering means is integrated with a rest of the damper (5). A stud (98) shaped and projecting from at least one side of the damper; The motor reduction gear according to claim 3, characterized in that:   5. The seal (9) is a washer (40) press-fit to the gearbox. The motor speed reduction device according to claim 1, wherein the motor speed reduction device is fixed to a wall of the motor speed reduction device.   6. The seal (9) is a resilient tab (9) which locks onto the wall (13) of the gearbox. 6. The motor speed reducer according to claim 5, wherein said motor speed reducer is fixed to said gearbox by (14).   7. A drive coaxial with the damper (5), the seal (9) and the gear (3). (11), said drum holding cables for cable operated window lifts The drum includes fixing means for rotating integrally with the damper. The motor reduction gear according to claim 5, characterized in that:   8. The fixing means is a fin of the drum (11) cooperating with the damper (5). 8. The motor speed reducer according to claim 7, wherein the speed reducer comprises a mower (10).   9. The output member (15) is a single piece with the hub (17) inside the gear (3). A formed pinion (16), which is formed of fired steel and The hub is provided with a damper for fixing the output member to the damper and rotating the same integrally. 6. A finger (30) cooperating with a damper (5). Motor speed reducer.   10. The rotor shaft (23) is mounted on the stator (20) and has a ring (2). 4) is inserted between the rotor shaft and the stator, and the ring is an inner wall of the stator. Has an outer diameter (d2) equal to the diameter of the rotor shaft (23) and is larger than the diameter (d) of the rotor shaft (23). A first part (25) having a critical inner diameter (d1), and a diameter (d) of the rotor shaft; A second having an equal inner diameter and an outer diameter (d2) smaller than the inner diameter of the stator; Formed by two radially stepped portions comprising a portion (26); Thereby, an annular gap (28) is formed between the second part (26) and the inner wall of the stator. And an annular gap (27) is formed between the rotor shaft and the first part (25). 10. The motor reduction gear according to claim 1, wherein the motor reduction gear is defined. Place.   11. The motor speed reduction device includes a speed reduction stopper (19) formed of an elastic material, and The stopper comprises a metal washer (21) embedded in the stopper, and the rotor shaft ( The end of 1) uses the washer by a preload to automatically detect axial play. The motor according to any one of claims 1 to 9, wherein the motor is configured to be biased. Speed device.   12. The motor speed reducer uses a damper (15) made of an elastic material and reduces the motor speed. The axial compression force (F) applied by the damper during operation of the transmission is controlled to a predetermined value (F2). Rigid stopper means (18, 21) which can be Means (22, 23) for preventing rotation about the axis of the rotor shaft (6). The motor reduction device according to any one of claims 1 to 10, further comprising: Place.   13. The rigid stopper (18) is inserted between the end (6a) and the shaft (6). And the damper (15) is mounted on the shaft (6) in the gearbox (14). Stopper means formed in the end of the gear box by sliding in the axial direction with respect to 13. The motor speed reduction device according to claim 12, wherein the motor speed reduction device is configured to be in contact with (21). .   14． The stopper means is provided in the gear box (facing the damper (15)). 14. The motor according to claim 13, which is arranged in the inner wall (13) of (14). Speed reducer.   15. Means for preventing rotation are at least one radial tab (22); Preferably, it protrudes from the periphery of the rigid stopper (18) and 14) corresponding notches in the inner wall (13) (23) engaging two radially opposed tabs (22), The notch has a movement range (d) equal to the axial play of the rigid stopper (18). 13. The mold according to claim 12, wherein a long hole is formed to allow sliding. Data reduction gear.